Older estimates have long suggested that 100 billion was the magic number, but some more recent research suggests that the brain actually contains fewer neurons than previously believed. (verywellmind.com)
A trained athlete's brain is a marvel of efficiency, using fewer neurons to move faster, calculate better — and make better decisions. (discovermagazine.com)
They discovered a pattern: Small - brained animals with fewer neurons in the wrinkly outer layer of the brain, called the cortex, had shorter yawns than large - brained animals with more cortical neurons. (sciencemag.org)